The Dow Jones Industrial Average (DJI - 13,412.53) is down 136 points, or 1%, thanks to a round of lackluster earnings reports that included Microsoft Corporation (NASDAQ:MSFT), Google Inc (NASDAQ:GOOG), and General Electric Company (NYSE:GE). Adding insult to injury, the National Association of Realtors revealed that existing home sales fell by 1.7% to a seasonally adjusted yearly rate of 4.75 million last month, while economists had projected a decline to just 4.8 million. Elsewhere, the CBOE Market Volatility Index (VIX - 15.88) is 0.9 point, or 5.7%, higher.

Here are a few noteworthy stats at midday:

1. The equity put/call volume ratio across all 10 options exchanges stands at 0.95, with 4.2 million calls changing hands so far today, compared to 4.0 million puts.
   
   
2. Among the equities with heavy call activity is Xerox Corporation (NYSE:XRX - 7.03), despite a decline of around 4.6% today. Currently, calls account for 98.6% of the paper product king's intraday option volume.
   
   
3. The put/call volume ratio on the iPath S&P 500 VIX Short-Term Futures ETN (NYSEARCA:VXX - 33.81) checks in at 0.55, with calls almost doubling puts.
   
   
4. The Nasdaq shows an advance/decline ratio of 0.27, with the number of downward movers more than tripling the advancers.
   
   
5. Among the Nasdaq's major decliners is Marvell Technology Group Ltd. (NASDAQ:MRVL - 7.59), which has shed about 14% -- and tagged a new multi-year low of $7.57 -- in intraday trading after issuing a weak third-quarter guidance yesterday. The news also triggered downgrades from Lazard, FBR, Craig-Hallum, Deutsche Bank, and Jefferies this morning, along with a slew of price-target cuts.